Gas pump misery

From what I've read in old forums, this problem happens alot with the Ford Mustang.  I don't know if you have one, but here is the blog and some solutions from other folk whom experienced the same or similar problem you are experiencing: 

www.allfordmustangs.com/forums/2005-mustang-gt-tech/38908-trouble-pumping-gas-print.html 

I hope this helps. 

The problem you're describing happens due to the air which is trapped inside the gas tank of your car. Most probably the ventilation tubes are blocked. try to put the gas pump gun on the first stop so it will pump slower.

Also make sure the nozzle is all the way in, start slowly and as it starts going, then you can increase the flow.

The problem lies with the ventilation system ( for vapor recovery) for the gas tank. Essentially the gas tank cannot breath which is causing the gas to back up into the gas tank filler neck. The gas pump is doing what it is "supposed" to do and shuts off when it senses that. This normally only backs up into the filler neck when it get near full. However due to the ventialtion problem, it is backing up much sooner. EX: You may really need 12 gallons to fill the tank, but the pump is kicking off at 1 gallon.  Suggest going to the dealer for such a repair.